Apentix/AP Physics 1/Unit 5: Momentum/Question

AP Physics 1mediummcq1 pt

A 1.0 kg ball moving east at 2.0 m/s collides elastically with a 1.0 kg ball moving west at 2.0 m/s. After the collision, the balls

A.reverse directions with the same speeds

B.stop dead

C.stick together and stop

D.both move east at 2.0 m/s

Explanation

Core Concept

Equal masses and equal-opposite momenta: they bounce back at 2.0 m/s each.

Correct Answer

Areverse directions with the same speeds

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